Self-opening tool holder



Jan.- 3o, 1923; 1,443,687

` w, HUGHES. F OPENI lll I l Y l 11 l NIH www

M @may Jam. 30, 1923. 1,443,687.

w. HUGHES. l v

SELF OPENING Tool. HOLDER. F1 LED Dscy 22. 1920.

3 SHEETS-SHEET 3 Patented Jan. 30, 1923.

liii/"initiale Huenns, or PHILADELPHIA, PENNSYLVANIA, `assrsivoa moana nnss- BRIGHT MANUFACTURING contraria A vricercaArion or parat-Naan.

SELF-OPENING Toon-HOLDER. c

Application filed December 22, 1920. Serial No. 432,1203.

particularly for an objectthe `actuation of a pair oi cutters in a metal working machine, whereby these may be concurrently heldin their operative position uponopposite sides of a workpiece during the cutting .movement, and released and held in idle positions during 'the return movement.

In the drawings accompanying this specitication one practicable embodiment oi' the invention is illustrated, in which'drawings,

Figure 1 shows'in elevation a portion of a machine tool equipped with my improved tool actuating and contro-lling device.

`F ig. 2 is an elevational view of the major portion of the device, looking at this portion from the left-hand side in Fig. 1, and on a larger scale.

Fig. 3 is a plan view of a portion of the device shown in Fig. 2, the bed plate of the machine, however, being omitted.

Fig. 4: is a view somewhat similar to Fig. 3, but showing the top. plate removed; the better to illustrate the construction` of the toggle mechanism and the pivotally mounted tool holders.

Figs. 5 and 6.are details of construction showing various operative positions of .certain parts, these latter gures showing the same elevation and being on the same scale as Fig. l, and y Fig. 7 is a sectional detail taken on a plane yat about the line 7-7 of Fig. 4t, but shown `as of the same scale as l.

My improvement is intended for use o n a machine in which the tools have a reciprocatory movement in relation to the work, and are operative in the 'forward excursion and pass idly over the work in their recessional movement. lt has been found desirable, especially in metal working machines, when the work performed by the tool has been a tinishing cut, to movethe'cutting portion` of the toolinto a position out oi? the Ypath ot movement of the work, since it is :,nism carrying the .tool holders.

obvious that after thetool has completed its cutting operation and moved past the ,work it l,will anaturally. springsliglzitly-l 1in- .wardlyot `'the planeoi the icutysurface, and .the `tool in itsvrecessional, movement, which is genlally faster fthani the v:cutting: ymovement,1 rthen `has the effect of Ascoring .the otherwise finished surfacef of the i work. Assuming; 'that the .cutters move in a straight line' reciprocatory :pathand the work rotates, .the g finished. surface produced kby the .cutter 1s an even spir'alotxnarrowrconvolntio'ns, and theCscoring of-y thef cutters Vonkthe 1 return movement is ai deeper eutspiral oiwide convolutions. Such marring of thefi'nished sur- .jfacef necessitates that the nextoperationl to whichthefwork issubjectedY be moreextensive than otherwise,` necessary.` yInt another aspectof the situation the finishing toolsv are .not set ;toremove as muchof thevmetal as i they otherwise would b-ut for.v this scarring or .niarring.- According to my.invention, however, the tools, .representedin the draw'- ing as and y, areseparated. at :the completionV of their forward-traverse oil the workpiece A that is, inI almov-ement toward the .right in the drawings,so that upontheirrecessionthey clear thesiirfaceot the workpiece overy which they have performed their operation, and., are, after :being cleared of ,such work, again brought A.into theiroperative or cutting position in. theinterval dur- Iing which .one workpiece-is. removed and another placed at the working point ot the machine. In someinstanceszone ot the tools, mand y, may be employed for steadying the workpiece during the cutting operation ot vthe other. In-most instances, however, both :these tools. are* cuttingz tools, v and for, simplicity in `vthis description are lso referred-.to without, however,limitingthe scope of the claimstolmechanism in which both .tools are ot l.necessity simultaneously cutting the nrkpiece. .The tools. andq/are respectivelvmounted upontoggle cont-rolled pivotally mounted tool holders 7 andV 8. These tool holders. are moved into and out of working position by means oftoggle links 9 and 10, which vare .-,caused to` automatically function upon the. reciprocation of the mecha- I present `illustration the general casing or housing memberv 1l yfor these tool holders is adjustably mountedv in awell known manner upon a slide orcarriage l2 adapted tor autoln the matic reciprocation upon the framework 13 of the machine upon which the workpiece A is chucked. The carriage 12 moves, in the present illustration, in a horizontal direction from side to side as indicated bythe double headed arrow in Figure l. The upper por tion or housing 11 oit the tool holder is shown pivotally connected to the base portion le, which in turn is fastened by means ot T- bolts to the slide or carriage 12. The pivot pin is illustrated at 15. The pivot engaging portion 16 ot the housing is shown pinned, by a pin 17, to the pivot pin. The tool holder casing 11, in the illustration, is shown having a pivotal adjustment for raising and lowering the lworking point ot the tools by means of an adjusting screw 13, and is moved laterally to etlect the lateral position of the tools by means of suitable set nuts 19, 20 carried on a screw threaded`extension 21 ot the pin 15 and engaging upon the opposite sides ot a lug 22.

ln the illustration the tool y is mounted in asuitable socket formed in the forward end 23 of the tool holder 8. lhe tool is held in this socket for longitudinal adjust-ment by means of suitable set screws 2li. rlhe tool is shown mounted in a suitable socket formed in a. bit holder 25, the tools ai and g/ being frequently designated bits, which is carried by the forward end ot the tool holder 7, and is adapted for adjustn'ient transversely of the path of the tool movement. The tool itself is adapted for adjustment longitudinally and is held in position by suitable set screws 28. There is shown a slot 26 in the bit holder 25 occupied by a suitable set screw 27. At the end of holder 25 opposite the bit seat is shown an actuator engaging device, in the illustration a plate a8 held in posit-ion by a screw 49 and engaging' collars on a screw 50. By the mechanism just described, the distance apart ot the tools may be adjusted.

The tool holders 7 and 3 are provided with hubs or bosses 30 and 31 respectively, engaging suitably formed seats in the casing or housing ot' thedevice. The combined hub is shown provided with a taper bore in which there is mounted a taper pin 32 serving,in certain movements of the device, as a. tulcrum tor the levers. This pin is shown provided with a screw threaded stem 33 and set nuts 34: whereby it may be adjusted for takin up slack and compensating :tor wear.

*ach otl the toggle links 9 and 10 shown provided with rounding ends which fdt into sockets having walls ot' more than 180 degreets, the socket tor one end being t'ormed in the lever, and tor the other end in the adjacent sides ot a toggle link connecting and actuating block rlhe block is adapted to be pressed outwardly tor releasing the toggles and moving the tools away trom their working position by means ot' compression spring 36 engaging against the inner end of theI block 35 ind against the longitudinally adjustable block ln the illust-ration the toggles are moved into `alignment and the tools into working position by means of a stationary adjustable abutment 38 carried by an adjustable head 39 supported on a bracket fl() secured to the machine trame 13. The rearward or idle movement ot the device brings the block 35 against the abutment 38, as seen in 6, and by a. continua tion ot its movement in this direction it compresses the spring 36 and moves the parts into the ligure position. lllhercupon the spring pressed detent di, in the form of, a hook, passes beyond the end ot' the block 35, and holds this and the tool holders in their operative position and the spring 36 compressed. The detent i-1 is shown so holding the block in 1.

Upon the completion of the cutting operation, `the tools and their carrying devices continue tov move toi-ward, bringing a cam tace a2, carried by a link e3, pivoted at lt-Ll, to the head 39, under a cam engaging stub pin 35 carried by the detent al, thereby forcing the detent upwardly against the pressure ot its spring 46, and into such a position that it rises beyond the rear 'tace 47 of the block 35 thereby releasing such block to the action ot the spring 36, whereupon the block is moved to the Figure 5 position, the toggle released, and the tools opened and moved to idle position, in most instances both tools are withdrawn to such positions that they are 'tree ci the workpiece and run clear'of the :iurtaco they have lately finished. A. notch is shown cut in the upper surface ot' the block so that an abutment :tace is provided for the engagement o'i the dotent 4l whereby the outward or rearward movement ot such block is limited by the detent.

lt will be appreciated that the operation ot the mechanism illustrated and explained in the foregoing description is continuous and automatic with the continuous and automatic movement of the machine upon which it is mounted. wide range of adjustment is afforded for the tools in relation to the position at which the workpiece is held` and at which the various parts are capable of adjustment for compensating' inequalities and wear. Any Yfurther detailed description ot thc operation ot the machine doubtless unnecessary to those skilled in the art.

Biltho but a single operative embodiment ot my invention is shown in the drawings will be understood that changes in details of construction may be made, to meet various requirements. within the scope ot the claims without departing trom the spirit of the invention. j

,l claim my invention rEhe ornbination with a machine trame provided with ways, ot a. carriage mounted v for reciprocatiom-thereon, a pair of7 tool :holdersmounted on the carriage and provided with tools located Ltofsimultaneously traverse the opposite sides of a piece of work, an. actuator mo-unted on the carriage for n'ioving the tool holders toward and from each other for placing 'thevtools in operative and inoperative positions, and means mounted on the machine frame and located in position for automatically causing said actuator to function.

2. The combination with a machine frame provided with ways, of a carriage mounted for reciprocation thereon, a pair of tool holders pivotally mounted on the carriage in the form of levers, tools carried by the forward ends of the respective tool holders, an actuator mounted on the carriage, for separating the rearward end-of said tool holders to place the .tools inoperative position.- and for drawing said ends together Iforfvvithdrawing the tools from the work, and means mounted on the machine,I frame and located in position for causing the actuator to function at the forward movement and at the backward movement of the carriage.

3. The combination with a casing, of a pair of tool holders mounted thereon, each of said tool holders being in the form of a lever and having a hub or boss member constituting a fulcrum, there being a suitably formed socket in the hub constituted by the two bosses, said hub being provided with a taper bore. a` taper pin located in said bore and provided with means for moving it endwise for taking up slack, a tool carried by one end of each of the said levers, said tools being adapted for engaging the opposite sides of a piece of work, a toggle connecting the other ends ot the said levers, and means normally tending to hold the links of the toggle in alignment and the tools locked at their operative positions.

4. The combination with a casing, of a pair of tool holders mounted thereon, each of said tool holders being in the form of a lever and having a hub or boss member constituting a fulcrum there being a suitably formed socket in the hub constituted by the two bosses, said hub being provided with a taper bore, a. taper pin located in said bore and provided with means for moving it endwise for taking up slack. tools carried by one end of each of the said levers, said tools being adapted for engaging the opposite sides of a piece of work, a toggle connecting the other ends of the said levers, means normally tending to hold the links of the toggle in alignment and the tools locked at their operative positions, and automatic means for breaking the toggle and causing the tools to separate.

A self-opening tool comprising, a reciprocatory body, a pair of cutters carried thereby and adapted to concurrently act :uponyopposite sides of a workpiecemeans mounted on the carriage for positively moving the cutters into operative position and locking thev same thereat, and means located in positionin the path of movement ofthe said reciprocatory body, and adapted to act i upon the cutter moving means for automatically moving the cutters into operative position at the completion of the recessional movement of the body, and means located'v in position to automatically actuate'the cutter ,moving means and open the cutters upon the completion of the excursion of the said body.

6, A self-opening tool comprising, a reciprocatory body, a pair of cutters adapted to concurrently act upon opposite sides of a workpiece, a toggle connected with the cutters for closing and-opening the same, a spring normally tending to move the .toggleinto open position, means active upon the togglefor compressing thespring and positively moving the cutters into operative position at the completion of the recessional movement of the said body, and means for automatically releasing thetoggle to the influence of the saidv spring upon the comple- `tion of the excursion of the said body for opening the cutters.

7 The combination with a reciprocatory carriage, of a pair of tool holders in the form of levers disposed longitudinally of t-he carriage, tools carried by the forward s ends. of the res ective levers a block disposed between therearwardends of the levers and` rec-iprocatory longitudinally of the carriage, toggle links articulated to the block and to the respective levers and adapted upon its movement to cause the tools to approachand withdraw one from the other.

and means for automatically causing said block to reciprocate upon the forward and backward movements of the carriage.

8. The combinationwith a reciprocatory carriage, ofva pair of levers pivoted to the carriage and disposed longitudinally thereof, 'said levers being provided at their for ward ends with tool sockets, .a block disposed between the rearward ends of the levers and reciprocatory longitudinally thereof, a compression spring engaging said block and tending to move it rearwardly of the carriage, toggle links articulated to the block and to the respective levers and adapted upon its movement to cause the forward4 ends of the levers to approach and withdraw one from the other, detent adapted when in one position to hold the block in a forward position with the toggle links in alignment, and when in another position to limit the movement of theblock rearwardly under the influence of the spring, an adjustable actuator for engaging the block` and mOVngf/he same forward upon the ,rear-k ward movement of the carriage, and an adjust-able actuator for engaging the detenty and moving,` it from the first mentioned to the second mentioned position upon the forward movement of the carriage.

9. A self-opening toel Comprising a pair of levers of the rst class, the forward ends of said levers being provided with Cutters facing each other, a reeiproeatory block mounted between the rear ends ot said levers, and toggle links connecting the block with the levers, said block and levers having suitably formed sockets and the links having' suitably formed ends whereby the reeiproeution of said block causes the toggle links to positively move the levers in both directions.

l0. rlhe Combination With a easing, of a pair oiC levers mounted thereon, cutters mounted at the for verd ends of said levers and adapted 'to concurrently engage oppovsite sides olf i` piece of Work, and each of said cutters being independently longitudinally adjustable upon its respective lever, and one of sind cutters being movable trans- 'located transversely of tlie carriage sind disposed in 'the said transverse Opening,r in the lug; oi the causing, ineens for longitudinally adjusting said arbor, means 'for looking 1the lug` to the arbor, ineens lor ereventing` the arbor from rotation, and an adjustable support for the rearward end of the casing.

ln testimony whereof, l have affixed my signature hereto.

WILLIAB/l HUGHES. 

